minigbm: i915: add NV12 for EGLImage.

GPU decoder will use it. Unfortunately, IA doesn't support NV12 scanout plane
yet.

TEST=run mapped_texture_test -f NV12 of drm-tests package on amd64-generic
BUG=chromium:683347

Change-Id: If83f961d59fff1d174926df0d96b665aef8b6048
Reviewed-on: https://chromium-review.googlesource.com/527701
Commit-Ready: Dongseong Hwang <dongseong.hwang@intel.com>
Tested-by: Dongseong Hwang <dongseong.hwang@intel.com>
Reviewed-by: Dongseong Hwang <dongseong.hwang@intel.com>
Reviewed-by: Gurchetan Singh <gurchetansingh@chromium.org>
1 file changed